Sound absorbing surface



FIG. 1 is a perspective view of a sound absorbing surface showing my new design;

FIG. 2 is another perspective view thereof; and,

FIG. 3 is a front elevational view thereof.

The broken lines in FIG. 1 are included for the purpose of illustrating portions of the sound absorbing surface that form no part of the claimed design. 

CLAIM The ornamental design for a sound absorbing surface, as shown and described. 